Stock-based Compensation - Schedule of Stock Options Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
NUMBER OF OPTIONS
Options outstanding at beginning of year (in shares) | shares	6,457,343
Granted (in shares) | shares	1,283,884
Exercised (in shares) | shares	(616,248)
Canceled (in shares) | shares	(189,860)
Options outstanding at end of year (in shares) | shares	6,935,119
Options exercisable at end of year (in shares) | shares	4,720,178
WEIGHTED AVERAGE EXERCISE PRICE
Options outstanding at beginning of year, weighted average exercise price (in dollars per share) | $ / shares	$ 22.15
Granted (in dollars per share) | $ / shares	56.54
Exercised (in dollars per share) | $ / shares	8.97
Canceled (in dollars per share) | $ / shares	47.85
Options outstanding at end of year, weighted average exercise price (in dollars per share) | $ / shares	28.96
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 19.86
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Options outstanding (in years)	6 years 8 months 19 days
Options exercisable (in years)	5 years 9 months 24 days
AGGREGATE INTRINSIC VALUE
Options outstanding | $	$ 91,728
Options exercisable | $	$ 86,357